problem [ 'prɔ:bləms ]

• n.
  • a state of difficulty that needs to be resolved

    "she and her husband are having problems"; "urban problems such as traffic congestion and smog"

    同义词： job

  • a source of difficulty

    "what's the problem?"

    同义词： trouble

  • a question raised for consideration or solution

    "our homework consisted of ten problems to solve"

以上来源于: WordNet